Osawa, Thanks for the pointers. However, I do have a problem - how do I get to a custom preference file? I can't see anything offered in the Ethereal software to change the path of the preference file, and nothing in the docs of how to change that location and create an own preference file. I just see the default "preferences" file in c:\.ethereal, can't find any ethereal.conf file as mentioned in the docs. In the default preference file the option you mentioned (capture.prom_mode) is set to TRUE. I tried to force this option set via the command line (-o option), no success. Can you give me a description of how to generate the custom preferences file under Windows that you mentioned? Simon
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